Add text rendering support to wayland clients

include/client/pango.h

@@ -0,0 +1,12 @@
+#ifndef _SWAY_CLIENT_PANGO_H
+#define _SWAY_CLIENT_PANGO_H
+
+#include "client/window.h"
+#include "client/buffer.h"
+#include <stdarg.h>
+
+PangoLayout *get_pango_layout(struct window *window, struct buffer *buffer, const char *text);
+void get_text_size(struct window *window, int *width, int *height, const char *fmt, ...);
+void pango_printf(struct window *window, const char *fmt, ...);
+
+#endif

include/client/window.h

@@ -34,6 +34,7 @@ struct window {
         struct wl_callback *frame_cb;
         struct cursor cursor;
         uint32_t width, height;
+        char *font;
         cairo_t *cairo;
 };
 

swaybar/main.c

@@ -2,8 +2,11 @@
 #include <stdlib.h>
 #include "client/registry.h"
 #include "client/window.h"
+#include "client/pango.h"
 #include "log.h"
 
+#define MARGIN 5
+
 struct box_colors {
 	uint32_t border;
 	uint32_t background;
@@ -71,15 +74,17 @@ void cairo_set_source_u32(cairo_t *cairo, uint32_t color) {
 }
 
 void render() {
-	// Reset buffer
 	cairo_save(window->cairo);
 	cairo_set_operator(window->cairo, CAIRO_OPERATOR_CLEAR);
 	cairo_paint(window->cairo);
 	cairo_restore(window->cairo);
 
-	// Draw bar
 	cairo_set_source_u32(window->cairo, colors.background);
 	cairo_paint(window->cairo);
+
+	cairo_move_to(window->cairo, MARGIN, MARGIN);
+	cairo_set_source_u32(window->cairo, colors.statusline);
+	pango_printf(window, "TODO: finish bar");
 }
 
 int main(int argc, char **argv) {
@@ -101,6 +106,10 @@ int main(int argc, char **argv) {
 	desktop_shell_set_panel(registry->desktop_shell, output->output, window->surface);
 	desktop_shell_set_panel_position(registry->desktop_shell, DESKTOP_SHELL_PANEL_POSITION_BOTTOM);
 
+	int width, height;
+	get_text_size(window, &width, &height, "Test string for measuring purposes");
+	window->height = height + MARGIN * 2;
+
 	do {
 		if (window_prerender(window) && window->cairo) {
 			render();

wayland/pango.c

@@ -0,0 +1,59 @@
+#include <cairo/cairo.h>
+#include <pango/pangocairo.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include "client/window.h"
+#include "client/buffer.h"
+#include "log.h"
+
+PangoLayout *get_pango_layout(struct window *window, const char *text) {
+	PangoLayout *layout = pango_cairo_create_layout(window->cairo);
+	pango_layout_set_text(layout, text, -1);
+	PangoFontDescription *desc = pango_font_description_from_string(window->font);
+	pango_layout_set_font_description(layout, desc);
+	pango_layout_set_single_paragraph_mode(layout, 1);
+	pango_font_description_free(desc);
+	return layout;
+}
+
+void get_text_size(struct window *window, int *width, int *height, const char *fmt, ...) {
+	char *buf = malloc(2048);
+
+	va_list args;
+	va_start(args, fmt);
+	if (vsnprintf(buf, 2048, fmt, args) >= 2048) {
+		strcpy(buf, "[buffer overflow]");
+	}
+	va_end(args);
+
+	PangoLayout *layout = get_pango_layout(window, buf);
+	pango_cairo_update_layout(window->cairo, layout);
+
+	pango_layout_get_pixel_size(layout, width, height);
+
+	g_object_unref(layout);
+
+	free(buf);
+}
+
+void pango_printf(struct window *window, const char *fmt, ...) {
+	char *buf = malloc(2048);
+
+	va_list args;
+	va_start(args, fmt);
+	if (vsnprintf(buf, 2048, fmt, args) >= 2048) {
+		strcpy(buf, "[buffer overflow]");
+	}
+	va_end(args);
+
+	PangoLayout *layout = get_pango_layout(window, buf);
+	pango_cairo_update_layout(window->cairo, layout);
+
+	pango_cairo_show_layout(window->cairo, layout);
+
+	g_object_unref(layout);
+
+	free(buf);
+}

wayland/window.c

@@ -63,6 +63,7 @@ struct window *window_setup(struct registry *registry, uint32_t width, uint32_t
 	window->width = width;
 	window->height = height;
 	window->registry = registry;
+	window->font = "monospace 10";
 
 	window->surface = wl_compositor_create_surface(registry->compositor);
 	if (shell_surface) {
@@ -74,6 +75,8 @@ struct window *window_setup(struct registry *registry, uint32_t width, uint32_t
 		wl_pointer_add_listener(registry->pointer, &pointer_listener, window);
 	}
 
+	get_next_buffer(window);
+
 	window->cursor.cursor_theme = wl_cursor_theme_load("default", 32, registry->shm); // TODO: let you customize this
 	window->cursor.cursor = wl_cursor_theme_get_cursor(window->cursor.cursor_theme, "left_ptr");
 	window->cursor.surface = wl_compositor_create_surface(registry->compositor);
@@ -118,4 +121,5 @@ int window_render(struct window *window) {
 }
 
 void window_teardown(struct window *window) {
+	// TODO
 }